L4973D3.3 STMicroelectronics, L4973D3.3 Datasheet - Page 16
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L4973D3.3
Manufacturer Part Number
L4973D3.3
Description
IC BUCK SYNC 3.3/ADJ 3.5A SOIC20
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet
1.L4973D5.1-013TR.pdf
(28 pages)
Specifications of L4973D3.3
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.3V, 0.5 ~ 50 V
Current - Output
3.5A
Frequency - Switching
100kHz ~ 300kHz
Voltage - Input
8 ~ 55 V
Operating Temperature
-40°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
20-SOIC (7.5mm Width)
Power - Output
4W
Output Voltage
50 V
Mounting Style
SMD/SMT
For Use With
497-4743 - BOARD EVAL FOR L4973X SW REG
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L4973D3.3
Manufacturer:
ST-MICROE
Quantity:
251
Part Number:
L4973D3.3
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
L4973D3.3-013TR
Manufacturer:
ST
Quantity:
1 000
Part Number:
L4973D3.3-013TR
Manufacturer:
ST
Quantity:
20 000
Typical characteristics
16/28
Figure 21. Switching frequency vs.
Figure 23. Dropout voltage between pin
(KHz)
0.6
0.4
0.2
fsw
ΔV
(V)
105
100
95
90
0
0
0
10
input voltage
7,8 and 2,3
Tamb=25˚C
1
20
30
2
40
Tj=125˚C
Tj=0˚C
3
50 V
D97IN643
D97IN631
I
CC
O
(A)
(V)
Figure 22. Switching frequency vs.
Figure 24. Efficiency vs. output voltage
(KHz)
(%)
fsw
98
96
94
92
90
88
86
105
100
η
95
90
-50
0
junction temperature
(see
(see
10
0
Figure
Figure
100KHz
200KHz
20
50
4)
6)
30
I
V
O
CC
= 3A
100
= 50V
D97IN641
40
D97IN632
V
Tj(˚C)
O
(V)
L4973